Utilization of shea butter waste-derived hierarchical activated carbon for high-performance supercapacitor applications

In this work, carbonization and subsequent activation procedures were adopted to synthesize waste shea butter shells into oxygen-rich interconnected porous activated carbon (SAC_x, x is the mass ratio of KOH used for activation). The SAC_1.5 electrode material showed outstanding electrochemical performance with high specific capacitance (286.6F/g) and improved rate capability, owing to various synergistic effects originating from a high specific surface area (1233.5 m